Abstract: The results of experimental investigations of a bundle of tubes of an evaporative tubular heat exchanger are presented in this article. Evaporative effectiveness and mass transfer coefficient are estimated over a wide range of operating conditions. Based on the experiments, correlations are derived using multiple regression analysis. Results show that as the cooling film flow rate increases, evaporative effectiveness and mass transfer coefficient increases provided that the air flow rate is constant which is flowing from underneath the tubes of the evaporative tubular heat exchanger. The tubes are subjected to simultaneous flows of cooling water from the top; air flows from underneath with controlled amount of relative humidity and the process fluid is flowing through the tubes. Developed correlations are helpful in improvement of the design of heat transfer devices and many other engineering applications. Consideration of Relative humidity as one operating variable leads to novelty in

• Publication Date: 22-Feb-2015
• DOI: 10.15224/978-1-63248-039-2-24
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Abstract: In this article, the thermal performance of dual sensible heat storage unit in a solar cooker based on parabolic dish collector for evening cooking is experimentally investigated. In the experimental setup, solar cooker with dual sensible heat storage unit was placed on absorbing plate of parabolic dish collector. During sunshine hours, the dual sensible heat storage unit stores solar heat and in the evening time, firstly the solar cooker with sensible heat storage unit is transferred to an insulator box and then loaded with cooking food. Inner sensible heat storage material transfers its stored heat to the cooking pot while the outer sensible heat storage material helps in compensating the heat loss during the transfer of solar cooker from absorber plate to insulator. It has been found that, food was cooked when transfer time is 05 minutes, partially cooked when transfer time is 10 minutes and not cooked when transfer time is 15 minutes.

• Publication Date: 22-Feb-2015
• DOI: 10.15224/978-1-63248-039-2-25
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